Gestation Alters Maternal Gut Microbiota Millions of bacteria are living inside and on our body weighing around four pounds of our body weight. These bacteria are very useful and important in health and in fighting disease. These microbiomes are altered during gestation . It was seen that during pregnancy microbiomes are responsible for partial weight gain and some essential inflammatory responses . But the mechanism responsible for such changes is still unknown. Several studies have been done to see the changes in bacteria with progression in pregnancy . Recently in one of the studies, it was found that during pregnancy progesterone regulates the microbial composition of bacteria in such a way that may help the baby develop. It was found that as the pregnancy progressed there was a dramatic change in the composition of bacteria mostly during late pregnancy along with the increase in the relative abundance of Bifidobacterium . These bacteria metabolize the